Why Movies Based on Games Don't Work

"Another summer has come and is beginning to wane. I know this, because the first block buster video game has come out (Deus Ex) and there are no longer any movies coming out that I really care about. Now, I’ve made no secret in past articles that I am a big fan of story lines in games. Therefore, I should really be into anything that is going to give me a good story line, right?"